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为了实现大型飞机风洞模型动态视频变形测量,提出并实现了一种新的大幅面高精度的标定方法.该方法以张正友摄像机标定算法为基础,考虑到标定平面模板加工制造中的误差,采用了摄影测量中的光束平差算法来优化初始的标定结果.张正友标定算法只是考虑了镜头的二阶径向畸变,并在镜头畸变模型中加入了径向畸变、切向畸变和薄棱镜畸变的校正.实验表明,所提方法的相对误差小于1/5000,标定误差仅是张正友标定算法的27%,具有较高的测量精度.因此,该大测量幅面标定方法,不仅可以灵活地实现不同测量幅面的精确标定,而且还满足了风洞变形下的不同测量幅面的需求.
In order to realize the dynamic video deformation measurement of large aircraft wind tunnel model, a new method of large-format and high-precision calibration is proposed and implemented.This method is based on Zhang Zhengyou’s camera calibration algorithm, taking into account the errors in the machining of the calibration plane template, The beam adjustment algorithm in photogrammetry is used to optimize the initial calibration results.Zhang Zhengyou calibration algorithm only considers the second-order radial distortion of the lens and adds radial distortion, tangential distortion and thin prism distortion to the lens distortion model Calibration.Experiments show that the relative error of the proposed method is less than 1/5000, calibration error is only 27% of Zhang Zhengyou calibration algorithm, with higher measurement accuracy.Therefore, the method of calibration of large measurement format can not only flexibly realize different measurements Accurate calibration of the format, but also meets the needs of different measurement formats under the deformation of the wind tunnel.